【简答题】The variance is based on the between the value of each observation and the mean, the difference is called a about the mean. In the computation of the variance, the deviations about the mean are .
【单选题】I like wines with a delicate____.
【单选题】I like wines with adelicate ______.
【简答题】A.breakdown B.breakout C.breakaway D.breakin
【判断题】紫外线吸收剂的作用是吸收紫外线的光能,并将其转换成热能或无害的可见光波释放出来。
【简答题】的作用是吸收紫外线的光能,并将其转换成热能或无害的可见光波释放出来。